| | Test results |
| 0 | SWITCH POWER SUPPLY CHECK | All OK | Problems encountered | Operation |
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| Check the following, in order:- Engine compartment junction unit fuse;- Power supply for the switches See E3050 ELECTRIC FRONT WINDOWS | Move on to Step 1 | Fuse damaged | Replace the fuse and find out what could have caused it to blow |
| 1 | SERVICES RELAY POWER SUPPLY CHECK (POWER CIRCUIT) | All OK | Problems encountered | Operation |
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| Check that the services discharge relay is receiving the correct power supply from the battery.With the ignition ON, connect to the power supply for the relay from the Body Computer and check, when the electric windows are operated, that the supply is sent to the relay.Also check that the electrical connections between the Body Computer, battery and relay are not faulty See E3050 ELECTRIC FRONT WINDOWS  | Do not disconnect the relay |
| Move on to Step 2 | 1. No power supply from the battery2. Enablement for power supply not provided by the Body Computer3. Connections faulty | 1. Restore the correct power supply to the relay. If necessary, replace the faulty components (if a fuse is involved, first search for what has caused it to blow)2. Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.3. Restore the correct connections See E3050 ELECTRIC FRONT WINDOWS |
| 2 | RELAY OUTPUT CHECK | All OK | Problems encountered | Operation |
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| With the ignition ON, connect to the relay output and check, when the electric windows are operated, that the power supply is sent to the electric windows circuit.Also check that the connections between the services relay and the Driver''s/Passenger Door couplings are not faulty See E3050 ELECTRIC FRONT WINDOWS | Move on to Step 3 | 1. The power supply is not sent to the circuit2. Connections faulty | 1. Replace the services relay2. Restore the correct connections See E3050 ELECTRIC FRONT WINDOWS |
| 3 | ELECTRIC WINDOWS CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| The problem is due to the simultaneous presence of problems in the two front electric window circuits.Continue following the instructions for both electric windows, bearing in mind that the problems could be different for the two electric windows See table M003 ONE OF THE ELECTRIC FRONT WINDOWS IS NOT WORKING | End of diagnosis | The fault persists | Contact technical service for further information on the problem |